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Selective heap leaching gold extraction process for gold mine containing copper

A selective and heap leaching technology, which is applied in the field of hydrometallurgy, can solve the problems of high cost, large consumption of sodium cyanide, and environmental pollution, and achieve the effects of low consumption, high gold leaching rate, and wide utilization of resources

Active Publication Date: 2012-03-21
ZIJIN MINING GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a selective heap leaching gold extraction process for copper-containing gold ores, which solves the problems of large consumption of sodium cyanide, high cost, and serious environmental pollution in conventional processes.

Method used

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  • Selective heap leaching gold extraction process for gold mine containing copper
  • Selective heap leaching gold extraction process for gold mine containing copper
  • Selective heap leaching gold extraction process for gold mine containing copper

Examples

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Effect test

Embodiment 1

[0024] It comes from a copper-bearing gold mine in Yunnan, enriched by conventional cyanide heap leaching, the gold recovery rate is only about 60%, and the sodium cyanide consumption is greater than 10kg / t mine. The copper in the copper-bearing gold ore exists in the form of oxide ore, and the chemical composition of the ore is shown in Table 1.

[0025] Table 1 Chemical composition of a copper-bearing gold deposit in Yunnan

[0026]

[0027] *The unit is g / t.

[0028] The particle size of the raw ore is -60mm, the pH value is adjusted to 9.5 with lime, and 200g / L ammonium carbonate and 5g / L sodium cyanide are added for selective heap leaching. The heap height is 6m, and the heap leaching period is 6 months. 10L / (h·m 2 ), the leaching rate of gold is 77.4%, and the consumption of sodium cyanide is 1.7kg / t ore.

Embodiment 2

[0030] It comes from a copper-bearing gold mine in Fujian, enriched by conventional cyanide heap leaching, the gold recovery rate is only 65%, and the sodium cyanide consumption reaches 18kg / t mine. The copper in this copper-bearing gold ore exists in the mixed form of oxide ore and sulfide ore, and the chemical composition of the ore is shown in Table 2.

[0031] Table 2 Chemical composition of a copper-bearing gold deposit in Fujian

[0032]

[0033] *The unit is g / t.

[0034] The particle size of the raw ore is -20mm, adjust the pH value to 12 with caustic soda, add 5g / L ammonium carbonate, 50g / L ammonium chloride, 5g / L sodium cyanide for selective heap leaching, the heap height is 3m, and the heap leaching The cycle is 2 months, the spray intensity is 30L / (h·m 2 ), the leaching rate of gold is 86.4%, and the consumption of sodium cyanide is 1.1kg / t ore

Embodiment 3

[0036] It comes from a copper-bearing gold mine in Tajikistan, enriched by conventional cyanide heap leaching, the gold recovery rate is only 45%, and the sodium cyanide consumption reaches 20kg / t mine. The copper in the copper-bearing gold ore exists in the form of oxide ore, and the chemical composition of the ore is shown in Table 3.

[0037] Table 3 Chemical composition of a copper-bearing gold deposit in Tajikistan

[0038]

[0039] *The unit is g / t.

[0040] The particle size of the raw ore is -30mm, the pH value is adjusted to 12 with lime, and 0.5g / L ammonium carbonate and 0.5g / L sodium cyanide are added for selective heap leaching. The heap height is 4m, and the heap leaching period is 2 months. The shower strength is 20L / (h·m 2 ), the leaching rate of gold is 89.4%, and the consumption of sodium cyanide is 1.9kg / t ore.

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Abstract

The invention discloses a selective heap leaching gold extraction process for gold mine containing copper, belonging to the field of hydrometallurgy. The process comprises the steps of: smashing and heaping gold mine containing copper; carrying out alkali treatment on the mine; then adding ammonium salt and sodium cyanide according to a certain proportion to realize the selective leaching of the gold and the restriction to the leaching of the copper; and finally absorbing and extracting the gold from leaching solution by conventional active carbon. The invention has the advantages of simple process method, short procedure, simple equipment, easy implementation, high gold leaching efficiency, low consumption of sodium cyanide, low energy consumption, little investment and low cost, and is the gold extraction method with easy realization of industrialized production and favorable economical benefit.

Description

technical field [0001] The invention relates to hydrometallurgy, in particular to a selective heap leaching gold extraction process for copper-bearing gold ores. Background technique [0002] Gold minerals are often associated with copper ores, especially in some Proterozoic and Phanerozoic rocks with relatively new geological ages, as well as ores with volcanic origin. The most common copper sulfide minerals associated with gold are chalcopyrite and chalcocite, while azurite, malachite, cuprite and chrysocolla are often found in surface oxide deposits. All these copper minerals can be leached by cyanide ions at room temperature, and the leaching rate of copper varies from 5% to 10% (from chalcopyrite and chrysocolla) to more than 90% (from other copper minerals) . Therefore, they consume considerable amounts of free cyanide to produce a mixture of copper cyanide complexes, ions, ferrocyanide, cyanate or thiocyanate. Generally speaking, about 30kg / t of sodium cyanide is c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/14C22B3/24C22B11/00
CPCY02P10/20
Inventor 阮仁满衷水平王中溪
Owner ZIJIN MINING GROUP
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